From DocWiki

You can configure the number of times in a session that an end user can fail to log in to Cisco Unified MeetingPlace before the user profile becomes "locked." Users with locked user profiles cannot log in.

Restrictions

The preconfigured system administrator profile cannot be locked.

Before reaching the maximum number of login attempts, the user may restart the counter for failed login attempts by:

Closing the browser and opening a new one to continue the login attempts.

Ending the call to Cisco Unified MeetingPlace and making a new call to continue the login attempts.